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The existing Fell City wastewater treatment plant has a complete mix activated sludge biological reactor following a primary settling tank. A local company proposes to build a candy factory and to send its wastewater to the Fell City plant. The factory’s BOD is substantial but it is all dissolved, so the proposal is to pipe it directly to the biological reactor. Over the next five years, the city flow is expected to grow to 9800 m3/d (the 2025 flow). The existing reactor has a volume of 12,000 m3. Given the following information, determine the maximum flow that the wastewater plant can accept from the factory (in 2025) and still produce an effluent BOD of 25 mg/L.

City raw wastewater BOD = 200 mg/L

Factory BOD = 850 mg/L

Degradation reaction coefficient for BOD = 8.4/d

(This is not the coefficient to convert between BOD5 and BODu.)

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